Which one of the following is not an element?

What method can be used for the separation of two volatile liquids that have a significant difference in their boiling points?

Which of the following methods is adopted to obtain gasoline from crude oil?

Give the technique for the separation of the following:
$(i)$ Mixture of sugar and sand
$(ii)$ Mixture of kerosene and water
$(iii)$ Mixture of benzene and common salt
$(iv)$ Mixture of liquids with boiling points $356 \, K$ and $365 \, K$
$(v)$ Mixture of aniline and camphor

What are the fundamental components of matter?

Physical properties of ice, water, and steam are very different. What is the chemical composition of water in all three states?